Banca de DEFESA: IZA JAMILE MOREIRA VILAR PEREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : IZA JAMILE MOREIRA VILAR PEREIRA
DATE: 21/02/2025
TIME: 08:30
LOCAL: https://meet.google.com/smj-qurv-qmi
TITLE:

HISTOMORPHOMETRIC EVALUATION OF ORGANS AND ZOOTECHNICAL PERFORMANCE OF BROILERS SUBMITTED TO INCUBATION WITH INVERTED EGGS

KEY WORDS:

Broiler. Fertile eggs. Hatchery. Histology. Poultry.

PAGES: 49
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
SUMMARY:

Egg hatching has been undergoing improvements, with a view to modernization and technification. In this process, the occurrence of inverted eggs has become an increasingly constant challenge. This is a critical stage in poultry farming, as errors during egg selection have become increasingly common, both due to the speed of selection and the difficulty of identifying the position of these eggs. The aim of this study was to zootechnically evaluate the hatchability and intestinal absorption area of broilers subjected to an inverted position during incubation. In the experiment, 344 Ross and 344 Cobb eggs were used for incubation and data evaluation. After hatching, 240 birds were randomly selected for rearing. The eggs were distributed in four experimental treatments in the same industrial incubator. The experimental treatments were: T1 - Cobb batch - Eggs incubated in normal position; T2 - Ross batch - Eggs incubated in normal position; T3 - Cobb batch - Eggs incubated in inverted position; T4 - Ross batch - Eggs incubated in inverted position. Analysis was carried out on zootechnical and histomophometric data. Analyses were carried out on zootechnical and histomophometric data. With regard to zootechnical data, treatments T1 and T2 hatched at 90% (strain stand 86.00%) and 93.02 (strain stand 88.00%), while treatments T3 and T4 hatched at 74.71% and 69.19% respectively, considering the same stand values for the strains. Between T1 and T2 there was no statistical difference between the treatments, only a numerical difference in relation to the stand of each strain, while between T1 and T2 in relation to T3 and T4, in addition to the numerical difference, we observed a large relative difference between the variability of the groups, and the differences in the means of the groups were statistically significant. With regard to the histomorphometric data, the absorption area in both the jejunum and duodenum, T1 had the largest absorption area and T3 was even more significant than T2. t 7 days, there was a significant increase in the T1 and T2 groups, elucidating the statistical difference between all the treatments; with regard to the duodenum, T3 had the largest absorption area and was more significant than the others until 14 days. With regard to villus height, T1 showed the greatest variability between the groups and was significant in relation to all the treatments. In the duodenum, the villi showed the greatest difference in T3, but at 14 days T1 and T2 maintained a statistical difference (p<0.05), as in all the treatments where at 14 days the results were significant compared to the inverted egg treatments T3 and T4. The RStudio software (version RStudio R 4.3.2.) and the parametric ANOVA-Tukey test were used for all statistical analyses. With improvements in incubation methods, the occurrence of inverted eggs has become an increasingly constant challenge. The present study makes it clear that for the embryo to hatch in this position is laborious and for the hatched/viable ones there is still difficulty in rearing, as well as losses when compared to eggs incubated in the conventional position.

COMMITTEE MEMBERS:
Presidente - JOAQUIM EVENCIO NETO
Externa à Instituição - JESSICA DE TORRES BANDEIRA
Externa à Instituição - PRISCILLA MARIA CAVALCANTE ROCHA